The Key of Changes shows the 8-digit AHECC codes that have been replaced or added to the classification. It is a historical concordance between old and new codes. The attached Acrobat file contains a listing of all changes to AHECC codes that have occurred since the original version of the classification (produced on 1 January 1988) including changes introduced up till 1 January 2006.

The list has four columns:

Previous code

The code that has closed

Replacement code

The new code(s) that replaced a previous (or closed) code.

Date replaced

The date a previous (or closed) code ceased to operate, and was replaced by its new code(s).

Expiry date

The date a replacement code operated until, before it was replaced by a new code.

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